The main reason I assumed you didn't is because you linked to Hanlon's Razor and explained it in a way that made it seem like you didn't think the other person knew.

I think it's true to some extent that a lot of the backdoors really are just stupidity, like debugging tools put into prod for convenience. Rather than suggesting that it is genuine malice, maybe the right thing to say is that for security, it doesn't matter whether or not it is malice for most purposes. If it did, it would give more incentive to do as much as possible to disguise malicious backdoors as mistakes.